in cpp/HelloComposition/HelloComposition/microsoft.ui.composition.effects_impl.h [818:830]
IFACEMETHODIMP GetProperty(UINT index, _Outptr_ IPropertyValue ** value) override
{
return UsePropertyFactory([=](IPropertyValueStatics* statics)
{
switch (index)
{
case D2D1_GAUSSIANBLUR_PROP_STANDARD_DEVIATION: return statics->CreateSingle(BlurAmount, (IInspectable**)value);
case D2D1_GAUSSIANBLUR_PROP_OPTIMIZATION: return statics->CreateUInt32(Optimization, (IInspectable**)value);
case D2D1_GAUSSIANBLUR_PROP_BORDER_MODE: return statics->CreateUInt32(BorderMode, (IInspectable**)value);
default: return E_INVALIDARG;
}
});
}